# Cosmology – The Doctrine of The Universe

Cosmology – the doctrine of the universe as a whole, which includes the theory of astronomical observations covered the entire area as part of the universe. Modern cosmology considers the distribution, interaction and movement of the masses in space, its geometric properties, transforming the energy in the universe. Currently, cosmology – this is the theory of non-stationary universe, leading back from the works of AA Fridman (1922-1924 gg.).

Cosmology – the doctrine of the universe as a whole, which includes the theory of astronomical observations covered the entire area as part of the universe. Modern cosmology considers the distribution, interaction and movement of the masses in space, its geometric properties, transforming the energy in the universe. Currently, cosmology – this is the theory of non-stationary universe, leading back from the works of AA Fridman (1922-1924 gg.).

In theory, the Friedman matter that fills the universe, regarded as a continuous medium has a continuous zero subluminal speeds. It is usually used by the so-called comoving frame of reference with respect to which (by definition), the medium is at rest, and explore the behavior and properties of the space of this frame of reference – the so-called accompanying space. Time lines (xt = = const, i – 2, 3) concomitant system of reference are the world lines of the elements of the environment. The study conducted by the gravitational field equations, written in co-coordinates (without the equations of motion). This way of considering the motion is possible because the equations of motion in a gravitational field is a consequence of Einstein equations of the field. In comparing the modern relativistic cosmology the observable universe element of the environment (physically infinitely small volume of medium) is a volume containing a large number of clusters of galaxies.

The modern theory of homogeneous isotropic universe in its main outline was created by AA Fridman.

It should be said that the relativistic theory of Friedman allowed to eliminate the difficulties faced by nerelyatyvistskoy cosmology. Einstein’s gravitational theory is free from the gravitational paradox. She admits these types of non-stationary distribution of mass in the universe in which Newton’s gravitational theory is inadequate and for which there is a certain state of statistical or thermodynamic equilibrium. It is possible an unlimited increase in the entropy of the thermodynamic processes without attenuation or dissipation of the mass, which eliminates the thermodynamic difficulty of cosmology. Red shift caused by the expansion of matter and lowering the surface brightness of the emitting objects, provides a new opportunity to correct the photometric paradox.

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